Please answer all questions.
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| 1 | |
A proton (q=e, mp=1.67 x 10-27 kg) is accelerated from rest through a potential difference of 1.0 MV. What is the final speed? |
| | A) | 1.4 x 107 m/s |
| | B) | 1.4 x 104 m/s |
| | C) | 3.5 x 1016 m/s |
| | D) | 1.4 x 10-1 m/s |
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| 2 | |
Determine the electric potential at a distance of 3.0 cm from a point charge of 500µC. |
| | A) | 150 MV |
| | B) | 150 V |
| | C) | 5 GV |
| | D) | 150 TV |
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| 3 | |
A point charge of +2.0µC is placed at the origin of coordinates. A second, of -3.0µC, is placed on the x-axis at x=100 cm. At what point (or points) on the x-axis will the "electric" potential be zero? |
| | A) | x = 60 cm and x = 300 cm |
| | B) | x = -40 cm and x = 20 cm |
| | C) | x = -200 cm and x = -40 cm |
| | D) | x = 40 cm and x = -200 cm |
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| 4 | |
An electron has a speed of 6.0 x 105 m/s as it passes point A on its way to point B. Its speed at B is 12 x 105 m/s. What is the potential difference between A and B, and which is at the higher potential? |
| | A) | 0.17 V, B |
| | B) | 4.1 V, B |
| | C) | 3.1 V, B |
| | D) | 3.1 x 10-10 V, B |
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| 5 | |
Determine the charge on each plate of a 0.050-µF capacitor when the potential difference between the plates is 200 V. |
| | A) | 10 µC |
| | B) | 4.0 x 109 C |
| | C) | 2.5 x 10-10 C |
| | D) | 10 C |
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| 6 | |
The potential difference between two large parallel metal plates is 120 V. The plate separation is 3.0 mm. Find the electric field between the plates. |
| | A) | 40 V/m toward the negative plate |
| | B) | 0.36 V/m toward the negative plate |
| | C) | 40 kV/m toward the positive plate |
| | D) | 40 kV/m toward negative plate |
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| 7 | |
A potential difference of 24 kV maintains a downward-directed electric field between two horizontal parallel plates separated by 1.8 cm. Find the charge on an oil droplet of mass 2.2 x 10-13 kg that remains stationary in the field between the plates. |
| | A) | 1.6 x 10-18 C = 10e |
| | B) | 9.0 x 10-17 C = 562e |
| | C) | 1.6 x 10-15 C = 10000e |
| | D) | 1.6 x 10-16 C = 1000e |
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| 8 | |
A capacitor with air between its plates has capacitance of 3.0µF. What is its capacitance when wax of dielectric constant 2.8 is placed between the plates? |
| | A) | 0.93 µF |
| | B) | 1.1 µF |
| | C) | 24 µF |
| | D) | 8.4 µF |
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| 9 | |
Compute the energy stored in a 60-pF capacitor (a) when it is charged to a potential difference of 2.0 kV and (b) when the charge on each plate is 30 nC. |
| | A) | (a) 0.12 mJ (b) 7.5 µJ |
| | B) | (a) 120 mJ (b) 2.7 x 10-26 J |
| | C) | (a) .12 nJ (b) 250 J |
| | D) | (a) 60 nJ (b) 7.5 J |
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| 10 | |
(a) Calculate the capacitance of a capacitor consisting of two parallel plates separated by a layer of paraffin wax 0.50 cm thick, the area of each plate being 80 cm2. The dielectric constant for the wax is 2.0. (b) If the capacitor is connected to a 100-V source, calculate the charge on the capacitor and the energy stored in the capacitor. |
| | A) | (a) 280 nF (b) 3.6 TC, 0.14 µJ |
| | B) | (a) 28 pF (b) 2.8 nC, 0.14 µJ |
| | C) | (a) 11 pF (b) 280 fC, 0.14 µJ |
| | D) | (a) 28 fF (b) 2.8 nC, 0.14 pJ |
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